index.js

var express = require('express')
var request = require('request')
var bodyParser = require('body-parser')
var config = require('./config').Config

const gethRpcUrl = 'http://localhost:8545'

var app = express()
app.use(bodyParser.json())

app.get('/', function (req, res) {
  res.send('etherlab :)')
})

function authorize (req) {
  return typeof req.body.method !== 'undefined' && req.body.method
  && (config.authorized_calls.indexOf(req.body.method) > -1)
}

app.post('/', function (req, res) {
  if (authorize(req) || !config.enforce) {
    console.log(req.body.method)
    var data = JSON.stringify(req.body)
    var fwd_req = {
      uri: 'http://' + config.geth_addr + ':' + config.geth_port,
      method: 'POST',
      headers: {
        'content-type': 'application/json',
        'content-length': data.length
      },
    }

    var r = request.post(fwd_req)
    r.write(JSON.stringify(req.body))
    r.pipe(res, {end: true})
  } else {
    console.log('denied ' + req.body.method)
    res.json({ error: {message: 'unauthorized'}})
  }
})

app.listen(3000, function () {
  console.log('listening on port 3000!')
})